Rather than a snoot for hair light, I like a parabolic reflector, fitted with a honeycomb grid attachment, and barn doors, and very often, one or two thicknesses of mylar diffusing material attached in front of the honeycomb grid: this is exactly why the second, three-light kit
Adorama sells has a barn door kit that accepts a slide-in grid, and also slide-in color gel filters and a slide-in milky-colored diffuser.
Here is the adjustable reflector-sized barndoor,grid,and filter kit that comes with the $449 set, or which is sold for the bargain price of $39.95:
Flashpoint FP-LF-BD This uses a clever system that makes it adaptable to many,many brands of studio flash parabolic reflectors, of different sizes. It works very well on my Speedotron 7-inch reflectors, and I have also used it on a smaller JTL monolight's slightly bigger reflector (8.5-inch I believe).
With barn doors, you can "squeeze down" the beam spread from the standard reflector, and make it cover different-sized areas; using a parabolic reflector of the standard type if a fantastic way to light backgrounds, wither with our without the honeycomb grid; the red,blue, and yellow gels I have not found to be that interesting, but the holders are light-gauge metal, and you can un-glue the filters, and then glue on whatever other material you like. I consider a barndoor+grid+mylar diffuser set-up to be absolutely essential for portraiture.